Grab unique value out of an array in javascript

How to grab every unique value out of an array in javascript.

var arr = new Array();
var arr = [1,2,2,3,3,4,5,6,2,3,7,8,5,9];
UniqueValues(arr);	
	
function UniqueValues(a){
   var u = new Array();
   o:for(var i = 0, n = a.length; i < n; i++)
   {
      for(var x = 0, y = u.length; x < y; x++)
      {
         if(u[x]==a[i]) continue o;
      }
      u[u.length] = a[i];
   }
   return u;
}